[PATCH 06/10] mm/damon/sysfs-schemes: add a file for setting damos_filter->pass

SeongJae Park
2025-01-07T20:18:15Z

Only kernel-space DAMON API users can use inclusive DAMOS filters. Add
a sysfs file named 'pass' under DAMOS filter directory of DAMON sysfs
interface, to let the user-space users use inclusive DAMOS filters.

Signed-off-by: SeongJae Park <sj@kernel.org>
---
mm/damon/sysfs-schemes.c | 32 +++++++++++++++++++++++++++++++-
1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c
index 9a883e8aea1c..9e171046ee94 100644
--- a/mm/damon/sysfs-schemes.c
+++ b/mm/damon/sysfs-schemes.c
@@ -313,6 +313,7 @@ struct damon_sysfs_scheme_filter {
struct kobject kobj;
enum damos_filter_type type;
bool matching;
+ bool pass;
char *memcg_path;
struct damon_addr_range addr_range;
int target_idx;
@@ -385,6 +386,30 @@ static ssize_t matching_store(struct kobject *kobj,
return count;
}

+static ssize_t pass_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct damon_sysfs_scheme_filter *filter = container_of(kobj,
+ struct damon_sysfs_scheme_filter, kobj);
+
+ return sysfs_emit(buf, "%c\n", filter->pass ? 'Y' : 'N');
+}
+
+static ssize_t pass_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ struct damon_sysfs_scheme_filter *filter = container_of(kobj,
+ struct damon_sysfs_scheme_filter, kobj);
+ bool pass;
+ int err = kstrtobool(buf, &pass);
+
+ if (err)
+ return err;
+
+ filter->pass = pass;
+ return count;
+}
+
static ssize_t memcg_path_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
@@ -482,6 +507,9 @@ static struct kobj_attribute damon_sysfs_scheme_filter_type_attr =
static struct kobj_attribute damon_sysfs_scheme_filter_matching_attr =
__ATTR_RW_MODE(matching, 0600);

+static struct kobj_attribute damon_sysfs_scheme_filter_pass_attr =
+ __ATTR_RW_MODE(pass, 0600);
+
static struct kobj_attribute damon_sysfs_scheme_filter_memcg_path_attr =
__ATTR_RW_MODE(memcg_path, 0600);

@@ -497,6 +525,7 @@ static struct kobj_attribute damon_sysfs_scheme_filter_damon_target_idx_attr =
static struct attribute *damon_sysfs_scheme_filter_attrs[] = {
&damon_sysfs_scheme_filter_type_attr.attr,
&damon_sysfs_scheme_filter_matching_attr.attr,
+ &damon_sysfs_scheme_filter_pass_attr.attr,
&damon_sysfs_scheme_filter_memcg_path_attr.attr,
&damon_sysfs_scheme_filter_addr_start_attr.attr,
&damon_sysfs_scheme_filter_addr_end_attr.attr,
@@ -1901,7 +1930,8 @@ static int damon_sysfs_add_scheme_filters(struct damos *scheme,
sysfs_filters->filters_arr[i];
struct damos_filter *filter =
damos_new_filter(sysfs_filter->type,
- sysfs_filter->matching, false);
+ sysfs_filter->matching,
+ sysfs_filter->pass);
int err;

if (!filter)
--
2.39.5